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An undocumented feature of PHP3 (that probably nobody knows about) is that
the plus operator merges arrays. That is,
$array = $array1+$array2;
will cause $array to be the merge of the two arrays, $array1 and $array2.
Now, important notes:
1. It's undocumented, but unlike tons of other things in PHP3 that aren't
documented, it's undocumented for a reason. There's a good chance this
behavior will be dropped or changed in the future.
2. If you do decide to take your chances and use it, pay attention to the
fact it probably doesn't do what you want. The result is a merge of the
two arrays, which means that each index in each of the two arrays is copied
to the same index in the result array (if both arrays have an identical
index, the right one overrides the left one).
Changing the behavior of the operators for arrays isn't difficult, if we
ever decide what action we want them to do, if any.
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